Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type Blood (4) Serum or Plasma (5) (-) Urine (1) Test Area Drugs of Abuse (1) Exposure (1) (-) Therapeutics (1) Test Category Expectorants (1) Test Sub-Category Alpha-2 Adrenergic Agonists (1) Antivirals (1) GABA Analogues (1) (-) Other (1) Test Test Name 2185U Guaifenesin, Urine